起落架摆振的子空间模态参数辨识
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摘要
为给起落架稳定性合格审定提供依据,国内首次在某民用飞机上进行了摆振试验。试验时,在跑道上安装了激励板,飞机按要求的速度滑过激励板以激励起结构的动态响应。子空间模态参数辨识方法被引入到数据处理中,为剔除虚假模态,稳定图被引入以判别真实模态频率和系统的阶次。最后给出该飞机起落架的模态参数辨识结果。结果表明:激励板能有效地激励起结构的动态响应,结合了稳定图的子空间模态参数辨识方法给出了较好的辨识结果,起落架未发生摆振。
For the first time in China,a shimmy test was carried out on a civil aircraft to provide a basis for the qualification of landing gear stability. In the test,the excitation plate was installed on the runway,and the aircraft slid over the excitation plate at the required speed to excite the dynamic response of the structure. Subspace modal parameter identification method was introduced into data processing. In order to eliminate the false modal,stability diagram was introduced to distinguish the real modal frequency and the order of the system. Finally,the modal parameter identification results of the landing gear were given. The results show that the excitation plate can effectively excite the dynamic response of the structure,and the sub-space modal parameter identification method combined with the stability diagram can be used for better identification,and the landing gear does not shimmy.
For the first time in China,a shimmy test was carried out on a civil aircraft to provide a basis for the qualification of landing gear stability. In the test,the excitation plate was installed on the runway,and the aircraft slid over the excitation plate at the required speed to excite the dynamic response of the structure. Subspace modal parameter identification method was introduced into data processing. In order to eliminate the false modal,stability diagram was introduced to distinguish the real modal frequency and the order of the system. Finally,the modal parameter identification results of the landing gear were given. The results show that the excitation plate can effectively excite the dynamic response of the structure,and the sub-space modal parameter identification method combined with the stability diagram can be used for better identification,and the landing gear does not shimmy.
引文
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[15]常军,孙利民,张启伟.基于两阶段稳定图的随机子空间识别结构模态参数[J].地震工程与工程振动,2008,28(3):47-51.
[16]罗文波,夏松波,王莉,等.对用稳定图识别真假模态的一点改进[J].应用力学学报,1999(2):112-116.
[2]陈大伟,顾宏斌.起落架摆振控制及试验研究综述[J].飞机设计,2011,31(2):38-41.
[3]张家滨.基于子空间算法的结构模态参数识别与在线监测研究[D].南京:南京航空航天大学,2009.
[4]张家滨,陈国平.基于子空间算法的对称结构重频模态识别[J].南京航空航天大学学报.2012,44(2):191-197.
[5]PAZ MARIO.Dynamic condensation[J].AIAA Journal,1984,22(5):724-727.
[6]EWINS D J.Model Testing:Theory and Practice[M].Hertfordshire:Research Studies Press LTD,1984.
[7]THOMSON W T.Theory of Vibration With Applications[M],Prentice-Hall,1981.
[8]陈爱林,张令弥.基于随机子空间方法的模态参数识别研究[J].中国航空学报(英文版),2001,14(4):222-228.
[9]常军.随机子空间方法在桥梁模态参数识别中的应用研究[D].上海:同济大学,2006.
[10]Ibrahim S R.Model identification techniques assessment and comparison[J].Proc.of 3rd IMAC,1985.
[11]CHEN J C,KUO C P,GARBA J.Direct structural parameter identification by model test results[J].AIAAPaper,1983.
[12]史东锋,郑敏,申凡,等.工程结构工作模态的子空间辨识方法[J].振动工程学报.2000,13(3):406-412.
[13]徐亚卿,李永军,王天辉,等.高阶累积量的子空间模态参数辨识方法研究[J].机械与电子.2012(1):3-6.
[14]常军,张启伟,孙利民.随机子空间产生虚假模态及模态遗漏的原因分析[J].工程力学.2007,24(11):57-62.
[15]常军,孙利民,张启伟.基于两阶段稳定图的随机子空间识别结构模态参数[J].地震工程与工程振动,2008,28(3):47-51.
[16]罗文波,夏松波,王莉,等.对用稳定图识别真假模态的一点改进[J].应用力学学报,1999(2):112-116.